黄土丘陵区植被恢复及坡向对土壤SON含量的影响

doi:10.16036/j.issn.1000-2650.2019.05.012

摘要/Abstract

摘要： 【目的】探究黄土丘陵区乔木、灌木和草地这3种植被恢复类型是否能增加土壤可溶性有机氮（SON）含量以及坡向对SON的影响。【方法】以分别生长在阳坡和阴坡的沙棘和杏树、阳坡草地为研究对象,玉米地作为对照,采集0~10 cm、10~20 cm、20~40 cm土壤样品,测定土壤可溶性有机氮、有机质、碱解氮、速效磷、速效钾含量,分析坡向、树种对土壤养分及SON的影响。【结果】植被恢复显著增加SON含量,在0~10 cm土层增加尤为明显。SON占可溶性总氮的比例平均为84%,草地的比例显著最高。不同植被间SON含量差异显著,与玉米地相比,沙棘林土壤SON含量提升效果最为明显,其次为杏树林,草地在10~40 cm土层未达到提升水平。阳坡比阴坡土壤SON含量高,但土壤有机质、碱解氮、速效磷速效钾呈现相反规律。土壤SON与可溶性总氮呈现显著正相关关系,与土壤有机质、碱解氮、速效磷、速效钾没有达到显著相关水平。【结论】黄土丘陵区植被恢复显著增加了土壤SON含量,沙棘林在增加土壤SON含量方面优于杏树林及草地,阳坡环境对于土壤SON的积累效果优于阴坡环境。

关键词: 黄土丘陵区, 土壤可溶性有机氮, 植被恢复, 坡向

Abstract: 【Objective】 The objective of the study was to determine whether the vegetation restoration and aspect can increase soil soluble organic nitrogen (SON). 【Method】 Soil samples of0-10 cm, 10-20 cm and 20-40 cm from P. armeniaca, H. rhamnoides, grassland and farmland were collected. Soil SON, organic matter, available N, available P, and available K were measured. 【Results】 Soil SON was increased by vegetation restoration, particularly in the soil of 0-10 cm. SON on average accounted for 84% of total soluble N. There was significant difference in soil SON content between vegetations. Compared with Zea mays farmland, SON content of H. rhamnoides was the most effective, followed by P. armeniaca. However, grassland did not affect SON at 10-40 cm soil layer. The SON content in south-facing slope was higher than in the north-facing slope whilesoil organic matter, available N, available P, and available K showed contrary patterns. The SON showed a significant positive correlation with total soluble nitrogen but did not had significant correlations with soil organic matter, available N, available P and available K. 【Conclusion】 The vegetation restoration increased SON content. The south-facing slope and H. rhamnoides forest has relatively good effect on SON accumulation in the Loess Hilly region of China.

Key words: Loess Hilly region, soluble organic nitrogen, vegetation restoration, aspect

中图分类号:

S158.3

赵满兴, 曹阳阳, 白二磊, 王文强, 邢英英, 张晓曦. 黄土丘陵区植被恢复及坡向对土壤SON含量的影响[J]. 四川农业大学学报, 2019, 37(05): 670-675.

ZHAO Manxing, CAO Yangyang, BAI Erlei, WANG Wenqiang, XING Yingying, ZHANG Xiaoxi. Effects of Vegetation Restoration and Aspect on SON in the Loess Hilly Region[J]. Journal of Sichuan Agricultural University, 2019, 37(05): 670-675.

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